1 // SPDX-License-Identifier: GPL-2.0 2 #include <linux/kmod.h> 3 #include <linux/netdevice.h> 4 #include <linux/inetdevice.h> 5 #include <linux/etherdevice.h> 6 #include <linux/rtnetlink.h> 7 #include <linux/net_tstamp.h> 8 #include <linux/phylib_stubs.h> 9 #include <linux/ptp_clock_kernel.h> 10 #include <linux/wireless.h> 11 #include <linux/if_bridge.h> 12 #include <net/dsa_stubs.h> 13 #include <net/netdev_lock.h> 14 #include <net/wext.h> 15 16 #include "dev.h" 17 18 /* 19 * Map an interface index to its name (SIOCGIFNAME) 20 */ 21 22 /* 23 * We need this ioctl for efficient implementation of the 24 * if_indextoname() function required by the IPv6 API. Without 25 * it, we would have to search all the interfaces to find a 26 * match. --pb 27 */ 28 29 static int dev_ifname(struct net *net, struct ifreq *ifr) 30 { 31 ifr->ifr_name[IFNAMSIZ-1] = 0; 32 return netdev_get_name(net, ifr->ifr_name, ifr->ifr_ifindex); 33 } 34 35 /* 36 * Perform a SIOCGIFCONF call. This structure will change 37 * size eventually, and there is nothing I can do about it. 38 * Thus we will need a 'compatibility mode'. 39 */ 40 int dev_ifconf(struct net *net, struct ifconf __user *uifc) 41 { 42 struct net_device *dev; 43 void __user *pos; 44 size_t size; 45 int len, total = 0, done; 46 47 /* both the ifconf and the ifreq structures are slightly different */ 48 if (in_compat_syscall()) { 49 struct compat_ifconf ifc32; 50 51 if (copy_from_user(&ifc32, uifc, sizeof(struct compat_ifconf))) 52 return -EFAULT; 53 54 pos = compat_ptr(ifc32.ifcbuf); 55 len = ifc32.ifc_len; 56 size = sizeof(struct compat_ifreq); 57 } else { 58 struct ifconf ifc; 59 60 if (copy_from_user(&ifc, uifc, sizeof(struct ifconf))) 61 return -EFAULT; 62 63 pos = ifc.ifc_buf; 64 len = ifc.ifc_len; 65 size = sizeof(struct ifreq); 66 } 67 68 /* Loop over the interfaces, and write an info block for each. */ 69 rtnl_net_lock(net); 70 for_each_netdev(net, dev) { 71 if (!pos) 72 done = inet_gifconf(dev, NULL, 0, size); 73 else 74 done = inet_gifconf(dev, pos + total, 75 len - total, size); 76 if (done < 0) { 77 rtnl_net_unlock(net); 78 return -EFAULT; 79 } 80 total += done; 81 } 82 rtnl_net_unlock(net); 83 84 return put_user(total, &uifc->ifc_len); 85 } 86 87 static int dev_getifmap(struct net_device *dev, struct ifreq *ifr) 88 { 89 struct ifmap *ifmap = &ifr->ifr_map; 90 91 if (in_compat_syscall()) { 92 struct compat_ifmap *cifmap = (struct compat_ifmap *)ifmap; 93 94 cifmap->mem_start = dev->mem_start; 95 cifmap->mem_end = dev->mem_end; 96 cifmap->base_addr = dev->base_addr; 97 cifmap->irq = dev->irq; 98 cifmap->dma = dev->dma; 99 cifmap->port = dev->if_port; 100 101 return 0; 102 } 103 104 ifmap->mem_start = dev->mem_start; 105 ifmap->mem_end = dev->mem_end; 106 ifmap->base_addr = dev->base_addr; 107 ifmap->irq = dev->irq; 108 ifmap->dma = dev->dma; 109 ifmap->port = dev->if_port; 110 111 return 0; 112 } 113 114 static int netif_setifmap(struct net_device *dev, struct ifreq *ifr) 115 { 116 struct compat_ifmap *cifmap = (struct compat_ifmap *)&ifr->ifr_map; 117 118 if (!dev->netdev_ops->ndo_set_config) 119 return -EOPNOTSUPP; 120 121 if (in_compat_syscall()) { 122 struct ifmap ifmap = { 123 .mem_start = cifmap->mem_start, 124 .mem_end = cifmap->mem_end, 125 .base_addr = cifmap->base_addr, 126 .irq = cifmap->irq, 127 .dma = cifmap->dma, 128 .port = cifmap->port, 129 }; 130 131 return dev->netdev_ops->ndo_set_config(dev, &ifmap); 132 } 133 134 return dev->netdev_ops->ndo_set_config(dev, &ifr->ifr_map); 135 } 136 137 /* 138 * Perform the SIOCxIFxxx calls, inside rcu_read_lock() 139 */ 140 static int dev_ifsioc_locked(struct net *net, struct ifreq *ifr, unsigned int cmd) 141 { 142 int err; 143 struct net_device *dev = dev_get_by_name_rcu(net, ifr->ifr_name); 144 145 if (!dev) 146 return -ENODEV; 147 148 switch (cmd) { 149 case SIOCGIFFLAGS: /* Get interface flags */ 150 ifr->ifr_flags = (short) dev_get_flags(dev); 151 return 0; 152 153 case SIOCGIFMETRIC: /* Get the metric on the interface 154 (currently unused) */ 155 ifr->ifr_metric = 0; 156 return 0; 157 158 case SIOCGIFMTU: /* Get the MTU of a device */ 159 ifr->ifr_mtu = dev->mtu; 160 return 0; 161 162 case SIOCGIFSLAVE: 163 err = -EINVAL; 164 break; 165 166 case SIOCGIFMAP: 167 return dev_getifmap(dev, ifr); 168 169 case SIOCGIFINDEX: 170 ifr->ifr_ifindex = dev->ifindex; 171 return 0; 172 173 case SIOCGIFTXQLEN: 174 ifr->ifr_qlen = dev->tx_queue_len; 175 return 0; 176 177 default: 178 /* dev_ioctl() should ensure this case 179 * is never reached 180 */ 181 WARN_ON(1); 182 err = -ENOTTY; 183 break; 184 185 } 186 return err; 187 } 188 189 int net_hwtstamp_validate(const struct kernel_hwtstamp_config *cfg) 190 { 191 enum hwtstamp_tx_types tx_type; 192 enum hwtstamp_rx_filters rx_filter; 193 int tx_type_valid = 0; 194 int rx_filter_valid = 0; 195 196 if (cfg->flags & ~HWTSTAMP_FLAG_MASK) 197 return -EINVAL; 198 199 tx_type = cfg->tx_type; 200 rx_filter = cfg->rx_filter; 201 202 switch (tx_type) { 203 case HWTSTAMP_TX_OFF: 204 case HWTSTAMP_TX_ON: 205 case HWTSTAMP_TX_ONESTEP_SYNC: 206 case HWTSTAMP_TX_ONESTEP_P2P: 207 tx_type_valid = 1; 208 break; 209 case __HWTSTAMP_TX_CNT: 210 /* not a real value */ 211 break; 212 } 213 214 switch (rx_filter) { 215 case HWTSTAMP_FILTER_NONE: 216 case HWTSTAMP_FILTER_ALL: 217 case HWTSTAMP_FILTER_SOME: 218 case HWTSTAMP_FILTER_PTP_V1_L4_EVENT: 219 case HWTSTAMP_FILTER_PTP_V1_L4_SYNC: 220 case HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ: 221 case HWTSTAMP_FILTER_PTP_V2_L4_EVENT: 222 case HWTSTAMP_FILTER_PTP_V2_L4_SYNC: 223 case HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ: 224 case HWTSTAMP_FILTER_PTP_V2_L2_EVENT: 225 case HWTSTAMP_FILTER_PTP_V2_L2_SYNC: 226 case HWTSTAMP_FILTER_PTP_V2_L2_DELAY_REQ: 227 case HWTSTAMP_FILTER_PTP_V2_EVENT: 228 case HWTSTAMP_FILTER_PTP_V2_SYNC: 229 case HWTSTAMP_FILTER_PTP_V2_DELAY_REQ: 230 case HWTSTAMP_FILTER_NTP_ALL: 231 rx_filter_valid = 1; 232 break; 233 case __HWTSTAMP_FILTER_CNT: 234 /* not a real value */ 235 break; 236 } 237 238 if (!tx_type_valid || !rx_filter_valid) 239 return -ERANGE; 240 241 return 0; 242 } 243 244 /** 245 * dev_get_hwtstamp_phylib() - Get hardware timestamping settings of NIC 246 * or of attached phylib PHY 247 * @dev: Network device 248 * @cfg: Timestamping configuration structure 249 * 250 * Helper for calling the default hardware provider timestamping. 251 * 252 * Note: phy_mii_ioctl() only handles SIOCSHWTSTAMP (not SIOCGHWTSTAMP), and 253 * there only exists a phydev->mii_ts->hwtstamp() method. So this will return 254 * -EOPNOTSUPP for phylib for now, which is still more accurate than letting 255 * the netdev handle the GET request. 256 */ 257 int dev_get_hwtstamp_phylib(struct net_device *dev, 258 struct kernel_hwtstamp_config *cfg) 259 { 260 struct hwtstamp_provider *hwprov; 261 262 hwprov = rtnl_dereference(dev->hwprov); 263 if (hwprov) { 264 cfg->qualifier = hwprov->desc.qualifier; 265 if (hwprov->source == HWTSTAMP_SOURCE_PHYLIB && 266 hwprov->phydev) 267 return phy_hwtstamp_get(hwprov->phydev, cfg); 268 269 if (hwprov->source == HWTSTAMP_SOURCE_NETDEV) 270 return dev->netdev_ops->ndo_hwtstamp_get(dev, cfg); 271 272 return -EOPNOTSUPP; 273 } 274 275 if (phy_is_default_hwtstamp(dev->phydev)) 276 return phy_hwtstamp_get(dev->phydev, cfg); 277 278 return dev->netdev_ops->ndo_hwtstamp_get(dev, cfg); 279 } 280 281 static int dev_get_hwtstamp(struct net_device *dev, struct ifreq *ifr) 282 { 283 const struct net_device_ops *ops = dev->netdev_ops; 284 struct kernel_hwtstamp_config kernel_cfg = {}; 285 struct hwtstamp_config cfg; 286 int err; 287 288 if (!ops->ndo_hwtstamp_get) 289 return dev_eth_ioctl(dev, ifr, SIOCGHWTSTAMP); /* legacy */ 290 291 if (!netif_device_present(dev)) 292 return -ENODEV; 293 294 kernel_cfg.ifr = ifr; 295 netdev_lock_ops(dev); 296 err = dev_get_hwtstamp_phylib(dev, &kernel_cfg); 297 netdev_unlock_ops(dev); 298 if (err) 299 return err; 300 301 /* If the request was resolved through an unconverted driver, omit 302 * the copy_to_user(), since the implementation has already done that 303 */ 304 if (!kernel_cfg.copied_to_user) { 305 hwtstamp_config_from_kernel(&cfg, &kernel_cfg); 306 307 if (copy_to_user(ifr->ifr_data, &cfg, sizeof(cfg))) 308 return -EFAULT; 309 } 310 311 return 0; 312 } 313 314 /** 315 * dev_set_hwtstamp_phylib() - Change hardware timestamping of NIC 316 * or of attached phylib PHY 317 * @dev: Network device 318 * @cfg: Timestamping configuration structure 319 * @extack: Netlink extended ack message structure, for error reporting 320 * 321 * Helper for enforcing a common policy that phylib timestamping, if available, 322 * should take precedence in front of hardware timestamping provided by the 323 * netdev. If the netdev driver needs to perform specific actions even for PHY 324 * timestamping to work properly (a switch port must trap the timestamped 325 * frames and not forward them), it must set dev->see_all_hwtstamp_requests. 326 */ 327 int dev_set_hwtstamp_phylib(struct net_device *dev, 328 struct kernel_hwtstamp_config *cfg, 329 struct netlink_ext_ack *extack) 330 { 331 const struct net_device_ops *ops = dev->netdev_ops; 332 struct kernel_hwtstamp_config old_cfg = {}; 333 struct hwtstamp_provider *hwprov; 334 struct phy_device *phydev; 335 bool changed = false; 336 bool phy_ts; 337 int err; 338 339 hwprov = rtnl_dereference(dev->hwprov); 340 if (hwprov) { 341 if (hwprov->source == HWTSTAMP_SOURCE_PHYLIB && 342 hwprov->phydev) { 343 phy_ts = true; 344 phydev = hwprov->phydev; 345 } else if (hwprov->source == HWTSTAMP_SOURCE_NETDEV) { 346 phy_ts = false; 347 } else { 348 return -EOPNOTSUPP; 349 } 350 351 cfg->qualifier = hwprov->desc.qualifier; 352 } else { 353 phy_ts = phy_is_default_hwtstamp(dev->phydev); 354 if (phy_ts) 355 phydev = dev->phydev; 356 } 357 358 cfg->source = phy_ts ? HWTSTAMP_SOURCE_PHYLIB : HWTSTAMP_SOURCE_NETDEV; 359 360 if (phy_ts && dev->see_all_hwtstamp_requests) { 361 err = ops->ndo_hwtstamp_get(dev, &old_cfg); 362 if (err) 363 return err; 364 } 365 366 if (!phy_ts || dev->see_all_hwtstamp_requests) { 367 err = ops->ndo_hwtstamp_set(dev, cfg, extack); 368 if (err) { 369 if (extack->_msg) 370 netdev_err(dev, "%s\n", extack->_msg); 371 return err; 372 } 373 } 374 375 if (phy_ts && dev->see_all_hwtstamp_requests) 376 changed = kernel_hwtstamp_config_changed(&old_cfg, cfg); 377 378 if (phy_ts) { 379 err = phy_hwtstamp_set(phydev, cfg, extack); 380 if (err) { 381 if (changed) 382 ops->ndo_hwtstamp_set(dev, &old_cfg, NULL); 383 return err; 384 } 385 } 386 387 return 0; 388 } 389 390 static int dev_set_hwtstamp(struct net_device *dev, struct ifreq *ifr) 391 { 392 const struct net_device_ops *ops = dev->netdev_ops; 393 struct kernel_hwtstamp_config kernel_cfg = {}; 394 struct netlink_ext_ack extack = {}; 395 struct hwtstamp_config cfg; 396 int err; 397 398 if (copy_from_user(&cfg, ifr->ifr_data, sizeof(cfg))) 399 return -EFAULT; 400 401 hwtstamp_config_to_kernel(&kernel_cfg, &cfg); 402 kernel_cfg.ifr = ifr; 403 404 err = net_hwtstamp_validate(&kernel_cfg); 405 if (err) 406 return err; 407 408 err = dsa_conduit_hwtstamp_validate(dev, &kernel_cfg, &extack); 409 if (err) { 410 if (extack._msg) 411 netdev_err(dev, "%s\n", extack._msg); 412 return err; 413 } 414 415 if (!ops->ndo_hwtstamp_set) 416 return dev_eth_ioctl(dev, ifr, SIOCSHWTSTAMP); /* legacy */ 417 418 if (!netif_device_present(dev)) 419 return -ENODEV; 420 421 netdev_lock_ops(dev); 422 err = dev_set_hwtstamp_phylib(dev, &kernel_cfg, &extack); 423 netdev_unlock_ops(dev); 424 if (err) 425 return err; 426 427 /* The driver may have modified the configuration, so copy the 428 * updated version of it back to user space 429 */ 430 if (!kernel_cfg.copied_to_user) { 431 hwtstamp_config_from_kernel(&cfg, &kernel_cfg); 432 433 if (copy_to_user(ifr->ifr_data, &cfg, sizeof(cfg))) 434 return -EFAULT; 435 } 436 437 return 0; 438 } 439 440 static int generic_hwtstamp_ioctl_lower(struct net_device *dev, int cmd, 441 struct kernel_hwtstamp_config *kernel_cfg) 442 { 443 struct ifreq ifrr; 444 int err; 445 446 strscpy_pad(ifrr.ifr_name, dev->name, IFNAMSIZ); 447 ifrr.ifr_ifru = kernel_cfg->ifr->ifr_ifru; 448 449 err = dev_eth_ioctl(dev, &ifrr, cmd); 450 if (err) 451 return err; 452 453 kernel_cfg->ifr->ifr_ifru = ifrr.ifr_ifru; 454 kernel_cfg->copied_to_user = true; 455 456 return 0; 457 } 458 459 int generic_hwtstamp_get_lower(struct net_device *dev, 460 struct kernel_hwtstamp_config *kernel_cfg) 461 { 462 const struct net_device_ops *ops = dev->netdev_ops; 463 464 if (!netif_device_present(dev)) 465 return -ENODEV; 466 467 if (ops->ndo_hwtstamp_get) 468 return dev_get_hwtstamp_phylib(dev, kernel_cfg); 469 470 /* Legacy path: unconverted lower driver */ 471 return generic_hwtstamp_ioctl_lower(dev, SIOCGHWTSTAMP, kernel_cfg); 472 } 473 EXPORT_SYMBOL(generic_hwtstamp_get_lower); 474 475 int generic_hwtstamp_set_lower(struct net_device *dev, 476 struct kernel_hwtstamp_config *kernel_cfg, 477 struct netlink_ext_ack *extack) 478 { 479 const struct net_device_ops *ops = dev->netdev_ops; 480 481 if (!netif_device_present(dev)) 482 return -ENODEV; 483 484 if (ops->ndo_hwtstamp_set) 485 return dev_set_hwtstamp_phylib(dev, kernel_cfg, extack); 486 487 /* Legacy path: unconverted lower driver */ 488 return generic_hwtstamp_ioctl_lower(dev, SIOCSHWTSTAMP, kernel_cfg); 489 } 490 EXPORT_SYMBOL(generic_hwtstamp_set_lower); 491 492 static int dev_siocbond(struct net_device *dev, 493 struct ifreq *ifr, unsigned int cmd) 494 { 495 const struct net_device_ops *ops = dev->netdev_ops; 496 497 if (ops->ndo_siocbond) { 498 int ret = -ENODEV; 499 500 netdev_lock_ops(dev); 501 if (netif_device_present(dev)) 502 ret = ops->ndo_siocbond(dev, ifr, cmd); 503 netdev_unlock_ops(dev); 504 505 return ret; 506 } 507 508 return -EOPNOTSUPP; 509 } 510 511 static int dev_siocdevprivate(struct net_device *dev, struct ifreq *ifr, 512 void __user *data, unsigned int cmd) 513 { 514 const struct net_device_ops *ops = dev->netdev_ops; 515 516 if (ops->ndo_siocdevprivate) { 517 int ret = -ENODEV; 518 519 netdev_lock_ops(dev); 520 if (netif_device_present(dev)) 521 ret = ops->ndo_siocdevprivate(dev, ifr, data, cmd); 522 netdev_unlock_ops(dev); 523 524 return ret; 525 } 526 527 return -EOPNOTSUPP; 528 } 529 530 static int dev_siocwandev(struct net_device *dev, struct if_settings *ifs) 531 { 532 const struct net_device_ops *ops = dev->netdev_ops; 533 534 if (ops->ndo_siocwandev) { 535 int ret = -ENODEV; 536 537 netdev_lock_ops(dev); 538 if (netif_device_present(dev)) 539 ret = ops->ndo_siocwandev(dev, ifs); 540 netdev_unlock_ops(dev); 541 542 return ret; 543 } 544 545 return -EOPNOTSUPP; 546 } 547 548 /* 549 * Perform the SIOCxIFxxx calls, inside rtnl_net_lock() 550 */ 551 static int dev_ifsioc(struct net *net, struct ifreq *ifr, void __user *data, 552 unsigned int cmd) 553 { 554 int err; 555 struct net_device *dev = __dev_get_by_name(net, ifr->ifr_name); 556 const struct net_device_ops *ops; 557 558 if (!dev) 559 return -ENODEV; 560 561 ops = dev->netdev_ops; 562 563 switch (cmd) { 564 case SIOCSIFFLAGS: /* Set interface flags */ 565 return dev_change_flags(dev, ifr->ifr_flags, NULL); 566 567 case SIOCSIFMETRIC: /* Set the metric on the interface 568 (currently unused) */ 569 return -EOPNOTSUPP; 570 571 case SIOCSIFMTU: /* Set the MTU of a device */ 572 return dev_set_mtu(dev, ifr->ifr_mtu); 573 574 case SIOCSIFHWADDR: 575 if (dev->addr_len > sizeof(struct sockaddr)) 576 return -EINVAL; 577 return dev_set_mac_address_user(dev, &ifr->ifr_hwaddr, NULL); 578 579 case SIOCSIFHWBROADCAST: 580 if (ifr->ifr_hwaddr.sa_family != dev->type) 581 return -EINVAL; 582 memcpy(dev->broadcast, ifr->ifr_hwaddr.sa_data, 583 min(sizeof(ifr->ifr_hwaddr.sa_data_min), 584 (size_t)dev->addr_len)); 585 netdev_lock_ops(dev); 586 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev); 587 netdev_unlock_ops(dev); 588 return 0; 589 590 case SIOCSIFMAP: 591 netdev_lock_ops(dev); 592 err = netif_setifmap(dev, ifr); 593 netdev_unlock_ops(dev); 594 return err; 595 596 case SIOCADDMULTI: 597 if (!ops->ndo_set_rx_mode || 598 ifr->ifr_hwaddr.sa_family != AF_UNSPEC) 599 return -EINVAL; 600 if (!netif_device_present(dev)) 601 return -ENODEV; 602 netdev_lock_ops(dev); 603 err = dev_mc_add_global(dev, ifr->ifr_hwaddr.sa_data); 604 netdev_unlock_ops(dev); 605 return err; 606 607 case SIOCDELMULTI: 608 if (!ops->ndo_set_rx_mode || 609 ifr->ifr_hwaddr.sa_family != AF_UNSPEC) 610 return -EINVAL; 611 if (!netif_device_present(dev)) 612 return -ENODEV; 613 netdev_lock_ops(dev); 614 err = dev_mc_del_global(dev, ifr->ifr_hwaddr.sa_data); 615 netdev_unlock_ops(dev); 616 return err; 617 618 case SIOCSIFTXQLEN: 619 if (ifr->ifr_qlen < 0) 620 return -EINVAL; 621 return dev_change_tx_queue_len(dev, ifr->ifr_qlen); 622 623 case SIOCSIFNAME: 624 ifr->ifr_newname[IFNAMSIZ-1] = '\0'; 625 return dev_change_name(dev, ifr->ifr_newname); 626 627 case SIOCWANDEV: 628 return dev_siocwandev(dev, &ifr->ifr_settings); 629 630 case SIOCDEVPRIVATE ... SIOCDEVPRIVATE + 15: 631 return dev_siocdevprivate(dev, ifr, data, cmd); 632 633 case SIOCSHWTSTAMP: 634 return dev_set_hwtstamp(dev, ifr); 635 636 case SIOCGHWTSTAMP: 637 return dev_get_hwtstamp(dev, ifr); 638 639 case SIOCGMIIPHY: 640 case SIOCGMIIREG: 641 case SIOCSMIIREG: 642 return dev_eth_ioctl(dev, ifr, cmd); 643 644 case SIOCBONDENSLAVE: 645 case SIOCBONDRELEASE: 646 case SIOCBONDSETHWADDR: 647 case SIOCBONDSLAVEINFOQUERY: 648 case SIOCBONDINFOQUERY: 649 case SIOCBONDCHANGEACTIVE: 650 return dev_siocbond(dev, ifr, cmd); 651 652 /* Unknown ioctl */ 653 default: 654 err = -EINVAL; 655 } 656 return err; 657 } 658 659 /** 660 * dev_load - load a network module 661 * @net: the applicable net namespace 662 * @name: name of interface 663 * 664 * If a network interface is not present and the process has suitable 665 * privileges this function loads the module. If module loading is not 666 * available in this kernel then it becomes a nop. 667 */ 668 669 void dev_load(struct net *net, const char *name) 670 { 671 struct net_device *dev; 672 int no_module; 673 674 rcu_read_lock(); 675 dev = dev_get_by_name_rcu(net, name); 676 rcu_read_unlock(); 677 678 no_module = !dev; 679 if (no_module && capable(CAP_NET_ADMIN)) 680 no_module = request_module("netdev-%s", name); 681 if (no_module && capable(CAP_SYS_MODULE)) 682 request_module("%s", name); 683 } 684 EXPORT_SYMBOL(dev_load); 685 686 /* 687 * This function handles all "interface"-type I/O control requests. The actual 688 * 'doing' part of this is dev_ifsioc above. 689 */ 690 691 /** 692 * dev_ioctl - network device ioctl 693 * @net: the applicable net namespace 694 * @cmd: command to issue 695 * @ifr: pointer to a struct ifreq in user space 696 * @data: data exchanged with userspace 697 * @need_copyout: whether or not copy_to_user() should be called 698 * 699 * Issue ioctl functions to devices. This is normally called by the 700 * user space syscall interfaces but can sometimes be useful for 701 * other purposes. The return value is the return from the syscall if 702 * positive or a negative errno code on error. 703 */ 704 705 int dev_ioctl(struct net *net, unsigned int cmd, struct ifreq *ifr, 706 void __user *data, bool *need_copyout) 707 { 708 int ret; 709 char *colon; 710 711 if (need_copyout) 712 *need_copyout = true; 713 if (cmd == SIOCGIFNAME) 714 return dev_ifname(net, ifr); 715 716 ifr->ifr_name[IFNAMSIZ-1] = 0; 717 718 colon = strchr(ifr->ifr_name, ':'); 719 if (colon) 720 *colon = 0; 721 722 /* 723 * See which interface the caller is talking about. 724 */ 725 726 switch (cmd) { 727 case SIOCGIFHWADDR: 728 dev_load(net, ifr->ifr_name); 729 ret = dev_get_mac_address(&ifr->ifr_hwaddr, net, ifr->ifr_name); 730 if (colon) 731 *colon = ':'; 732 return ret; 733 /* 734 * These ioctl calls: 735 * - can be done by all. 736 * - atomic and do not require locking. 737 * - return a value 738 */ 739 case SIOCGIFFLAGS: 740 case SIOCGIFMETRIC: 741 case SIOCGIFMTU: 742 case SIOCGIFSLAVE: 743 case SIOCGIFMAP: 744 case SIOCGIFINDEX: 745 case SIOCGIFTXQLEN: 746 dev_load(net, ifr->ifr_name); 747 rcu_read_lock(); 748 ret = dev_ifsioc_locked(net, ifr, cmd); 749 rcu_read_unlock(); 750 if (colon) 751 *colon = ':'; 752 return ret; 753 754 case SIOCETHTOOL: 755 dev_load(net, ifr->ifr_name); 756 ret = dev_ethtool(net, ifr, data); 757 if (colon) 758 *colon = ':'; 759 return ret; 760 761 /* 762 * These ioctl calls: 763 * - require superuser power. 764 * - require strict serialization. 765 * - return a value 766 */ 767 case SIOCGMIIPHY: 768 case SIOCGMIIREG: 769 case SIOCSIFNAME: 770 dev_load(net, ifr->ifr_name); 771 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 772 return -EPERM; 773 774 rtnl_net_lock(net); 775 ret = dev_ifsioc(net, ifr, data, cmd); 776 rtnl_net_unlock(net); 777 778 if (colon) 779 *colon = ':'; 780 return ret; 781 782 /* 783 * These ioctl calls: 784 * - require superuser power. 785 * - require strict serialization. 786 * - do not return a value 787 */ 788 case SIOCSIFMAP: 789 case SIOCSIFTXQLEN: 790 if (!capable(CAP_NET_ADMIN)) 791 return -EPERM; 792 fallthrough; 793 /* 794 * These ioctl calls: 795 * - require local superuser power. 796 * - require strict serialization. 797 * - do not return a value 798 */ 799 case SIOCSIFFLAGS: 800 case SIOCSIFMETRIC: 801 case SIOCSIFMTU: 802 case SIOCSIFHWADDR: 803 case SIOCSIFSLAVE: 804 case SIOCADDMULTI: 805 case SIOCDELMULTI: 806 case SIOCSIFHWBROADCAST: 807 case SIOCSMIIREG: 808 case SIOCBONDENSLAVE: 809 case SIOCBONDRELEASE: 810 case SIOCBONDSETHWADDR: 811 case SIOCBONDCHANGEACTIVE: 812 case SIOCSHWTSTAMP: 813 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 814 return -EPERM; 815 fallthrough; 816 case SIOCBONDSLAVEINFOQUERY: 817 case SIOCBONDINFOQUERY: 818 dev_load(net, ifr->ifr_name); 819 820 rtnl_net_lock(net); 821 ret = dev_ifsioc(net, ifr, data, cmd); 822 rtnl_net_unlock(net); 823 824 if (need_copyout) 825 *need_copyout = false; 826 return ret; 827 828 case SIOCGIFMEM: 829 /* Get the per device memory space. We can add this but 830 * currently do not support it */ 831 case SIOCSIFMEM: 832 /* Set the per device memory buffer space. 833 * Not applicable in our case */ 834 case SIOCSIFLINK: 835 return -ENOTTY; 836 837 /* 838 * Unknown or private ioctl. 839 */ 840 default: 841 if (cmd == SIOCWANDEV || 842 cmd == SIOCGHWTSTAMP || 843 (cmd >= SIOCDEVPRIVATE && 844 cmd <= SIOCDEVPRIVATE + 15)) { 845 dev_load(net, ifr->ifr_name); 846 847 rtnl_net_lock(net); 848 ret = dev_ifsioc(net, ifr, data, cmd); 849 rtnl_net_unlock(net); 850 return ret; 851 } 852 return -ENOTTY; 853 } 854 } 855